How to animate an object to revolve around a fixed point in blender?
As example I have a cube that revolves around an empty


Add empty and add cube

Select the cube and then select the empty and press ctrlp and select Object, the cube is parented to the empty

Select empty and press I and select rotation, so the empty has a rotation keyframe

the timeline you can use to pick another frame and enter 360 in highlight and press I to insert a keyframe: